Stir-Fried Bitter Melon and Eggplant with Miso

Bahan-bahan (2 porsi)

• 4 inches bitter melon (bitter gourd or goya)
• 2 Japanese eggplants ((or 1 Chinese eggplant, which is typically longer))
• 1 inch ginger
• 2 Tbsp neutral oil ((divided; plus more, if needed))
• 1 Tbsp miso
• 1 Tbsp mirin
• ½ Tbsp soy sauce
• ½ Tbsp sake